![]() Established balance measures including global (Brief Balance Evaluations Systems Test, BriefBEST), proactive (Timed Up and Go, TUG), and static balance (8-level balance scale, 8LBS), as well as fear of falling (Short Falls Efficacy Scale-International, FES-I) and fall occurrence in the past year, served as reference measurements. Single and multiple-step thresholds for each perturbation direction were determined via two observer-based evaluation schemes, which are the 1) consideration of all steps (all-step-count evaluation, ACE) and 2) consideration of those steps that extend the base of support in the direction of perturbation (direction-sensitive evaluation, DSE). Methods: This study involved 71 fall-prone older adults (aged ≥ 65) who underwent progressively increasing perturbations in four directions for the STT. The aim of this study was to investigate validity with respect to fall risk, interpretability, and feasibility of the STT using two different evaluation strategies. Furthermore, different schemes of observer-based evaluation seem possible. The Stepping Threshold Test (STT) is a newly developed instrumented test for reactive balance on a movable platform, however, it has not yet been validated for fall-prone older adults. Introduction: Measurement of reactive balance is critical for fall prevention but is severely underrepresented in the clinical setting due to the lack of valid assessments. 6Department of Sport Science, Human Performance Research Center, University of Konstanz, Konstanz, Germany.5Institute of Sports and Sports Sciences, Heidelberg University, Heidelberg, Germany.4Berlin School of Movement Science, Humboldt-Universität zu Berlin, Berlin, Germany.3Department of Training and Movement Sciences, Humboldt-Universität zu Berlin, Berlin, Germany.2School for Therapeutic Sciences, SRH University Heidelberg, Heidelberg, Germany.1Network Aging Research, Heidelberg University, Heidelberg, Germany. ![]() Michael Adams 1,2 Leon Brüll 1,3,4 Monika Lohkamp 2 Michael Schwenk 1,5,6 *
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